Heat olive oil in frying pan.,Add onion and celery and saute for 3 minutes.,Add ground beef and cook until brown.,Drain, if necessary.,Add peas and toss gently.,______,Whisk until well-mixed.,(Should be the consistency of gravy.) Add soup mixture to beef mixture and stir well.,Pour beef mixture into greased 13x9x2 pan.,Gently spoon (or pipe) mashed potatoes over all.,Sprinkle lightly with paprika.,Bake at 350F for 45-60 minutes, or until potatoes are lightly browned and beef mixture is bubbly.